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[libretiny] Fix BK72XX lwIP sanity check for reduced-plan boards

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BK SDK boards with CFG_LWIP_MEM_POLICY=LWIP_REDUCE_THE_PLAN (e.g. CB3S/
BK7231N) set PBUF_POOL_SIZE=3, which is too small for TCP_WND=4*MSS:
3*(1580-54)=4578 < 5840. Set PBUF_POOL_SIZE=4 on BK72XX so the lwIP
compile-time sanity check passes: 4*1526=6104 > 5840.

RTL(20) and LN(20) already have large enough PBUF pools.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
J. Nick Koston
2026-02-21 14:42:30 -06:00
parent 5d44a556a4
commit 2b00a809c8
1 changed files with 5 additions and 0 deletions
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5
esphome/components/libretiny/__init__.py
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@@ -373,6 +373,11 @@ def _configure_lwip(config: dict) -> None:
# LN882H uses MEM_LIBC_MALLOC=1 (system heap), so MEM_SIZE is irrelevant.
if CORE.is_bk72xx:
lwip_opts.append("MEM_SIZE=5120") # BK SDK: 32,768, RTL SDK: 5,120
# PBUF_POOL_SIZE: BK SDK "reduced plan" sets this to only 3, which is
# too small for TCP_WND=4×MSS (5840 > 3*1526=4578). Set to 4 so the
# lwIP sanity check passes: 4*1526=6104 > 5840.
# RTL(20) and LN(20) are already large enough.
lwip_opts.append("PBUF_POOL_SIZE=4")
cg.add_platformio_option("custom_options.lwip", lwip_opts)